Gabor Kovacs of 'smoke no smoke' puffs on an e-cigarette that his shop sells at Camden in London in this June 9, 2013 file photo. Twice as many U.S. middle and high school students used electronic ... more 
Gabor Kovacs of 'smoke no smoke' puffs on an e-cigarette that his shop sells at Camden in London in this June 9, 2013 file photo. Twice as many U.S. middle and high school students used electronic cigarettes, which mimic traditional cigarettes and deliver nicotine as a vapor, in 2012 than a year earlier, and these teens could be on the way to a lifelong addiction, according to a government report released on Thursday. REUTERS/Toby Melville/Files (BRITAIN - Tags: BUSINESS HEALTH SOCIETY) less 
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Reuters | Photo By TOBY MELVILLE / REUTERS
Thu, Sep 5, 2013 2:18 PM EDT